1999 Pontiac Grand Am Rough idle - stalls

Tiny
PARKERBAMA
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
This car after warming up has a rough idle while at stop lights/signs. I have changed the FPR, plugs, fuel filter but to no avail. Sometimes it will idle down to the point it will die. I have cleaned the IAC. I am lost. Other than that it seems to run pretty dern good.
Saturday, August 7th, 2010 AT 1:20 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Saturday, August 7th, 2010 AT 11:59 PM

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